Genuine OEM Nissan Engine Hose Clamp, part number 1643917B0A. This clamp is used to securely fasten engine hoses to their respective fittings, preventing leaks of vital fluids or air. It is typically found in the engine bay where hoses connect to components like the radiator or intake manifold. Made from durable metal, it provides a strong grip. Genuine OEM parts ensure the correct clamping force and material integrity for safe and efficient engine operation.